No, condensed milk is a completely different product that cannot be substituted for powdered milk.
Well, for evaporated milk, I just mix up powered milk with half the water - or double the powder, however you want to look at it. If you means sweetened condensed milk, add some sugar. How much?...
One is liquid and the other is powder with water in it.
Most powdered milk is dehydrated skim milk.
Powdered milk is available in grocery stores and supermarkets everywhere.